NC_BSS (what does this mean?)

Reading some code for a RZ micro I found:

static uint8_t An_Array[SIZE]__attribute((section("NC_BSS"),aligned(32)));

What is the meaning of this?

(I mean, I understand that the attribute mark is placing this array on the "NC_BSS" section but I don't know what this section is, or where it is or why this array is being put there, can someone explain?